// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/android/content_startup_flags.h"

#include "base/android/build_info.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/sys_info.h"
#include "cc/base/switches.h"
#include "content/public/browser/android/compositor.h"
#include "content/public/common/content_switches.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "ui/base/ui_base_switches.h"
#include "ui/native_theme/native_theme_switches.h"

namespace content {

void SetContentCommandLineFlags(bool single_process,
    const std::string& plugin_descriptor)
{
    // May be called multiple times, to cover all possible program entry points.
    static bool already_initialized = false;
    if (already_initialized)
        return;
    already_initialized = true;

    base::CommandLine* parsed_command_line = base::CommandLine::ForCurrentProcess();

    if (single_process) {
        // Need to ensure the command line flag is consistent as a lot of chrome
        // internal code checks this directly, but it wouldn't normally get set when
        // we are implementing an embedded WebView.
        parsed_command_line->AppendSwitch(switches::kSingleProcess);
    }

    parsed_command_line->AppendSwitch(switches::kEnablePinch);
    parsed_command_line->AppendSwitch(switches::kEnableViewport);
    parsed_command_line->AppendSwitch(switches::kEnableOverlayScrollbar);
    parsed_command_line->AppendSwitch(switches::kValidateInputEventStream);

    if (base::android::BuildInfo::GetInstance()->sdk_int() >= base::android::SDK_VERSION_MARSHMALLOW) {
        parsed_command_line->AppendSwitch(switches::kEnableLongpressDragSelection);
        parsed_command_line->AppendSwitchASCII(
            switches::kTouchTextSelectionStrategy, "direction");
    }

    // There is no software fallback on Android, so don't limit GPU crashes.
    parsed_command_line->AppendSwitch(switches::kDisableGpuProcessCrashLimit);

    // On legacy low-memory devices the behavior has not been studied with regard
    // to having an extra process with similar priority as the foreground renderer
    // and given that the system will often be looking for a process to be killed
    // on such systems.
    if (base::SysInfo::IsLowEndDevice())
        parsed_command_line->AppendSwitch(switches::kInProcessGPU);

    parsed_command_line->AppendSwitch(
        switches::kMainFrameResizesAreOrientationChanges);

    // Disable anti-aliasing.
    parsed_command_line->AppendSwitch(
        cc::switches::kDisableCompositedAntialiasing);

    parsed_command_line->AppendSwitch(switches::kUIPrioritizeInGpuProcess);

    if (!plugin_descriptor.empty()) {
        parsed_command_line->AppendSwitchNative(
            switches::kRegisterPepperPlugins, plugin_descriptor);
    }

    // Disable profiler timing by default.
    if (!parsed_command_line->HasSwitch(switches::kProfilerTiming)) {
        parsed_command_line->AppendSwitchASCII(
            switches::kProfilerTiming, switches::kProfilerTimingDisabledValue);
    }
}

} // namespace content
